/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: Hua YY
 * Date: 2023 —12 —03
 * Time: 19:39
 */

    class X{
        Y y=new Y();//1
        public X(){//2
            System.out.print("X");
        }
    }
    class Y{
        public Y(){//3
            System.out.print("Y");
        }
    }
    public class Z extends X{
        Y y=new Y();//4
        public Z(){//5
            System.out.print("Z");
        }
        public static void main(String[] args) {
            new Z();
        }
    }

